You're looking for phrases where the colloquial contraction itself carries a specific cultural or emotional subtext beyond its literal meaning. These are linguistic shortcuts that evoke a whole vibe, attitude, or situational context.
Here are common three-or-more-word phrases with strong connotative status:
Gotta tell ya: Connotes sharing a secret, gossip, or an urgent piece of personal news. It creates intimacy and anticipation.
Means: "I'm letting you in on something important or juicy."
Gotta be kidding: Connotes disbelief, shock, or frustration. It's a dramatic rejection of what was just said or done.
Means: "This is so absurd it cannot be real."
Gotta get going: A soft, polite, but firm connotation of ending a social interaction. It's the standard "exit phrase."
Means: "This conversation/event is now over for me, no hard feelings."
Wanna get outta here?: Loaded with connotation. It can be romantic (suggesting intimacy), conspiratorial (leaving a boring event), or simply a suggestion between friends.
Means: "This place/ situation is no longer desirable; let's go somewhere we can connect."
Wanna try it?: Connotes adventurousness, risk, or thinking outside the box. It can be used for anything from a new restaurant to a dangerous stunt.
Means: "Let's break from the routine and be spontaneous."
Kinda funny, but...: A classic "hedge." It softens a potentially awkward, critical, or personal observation that follows.
Means: "What I'm about to say is odd or might offend, so I'm preemptively disarming it."
Outta time / Outta luck: Both carry a connotation of finality and failure. The opportunity has irrevocably passed.
Connotation: "It's over. The window has closed. You have failed."
Whatcha talkin' 'bout...? (Often associated with the catchphrase "Whatchu talkin' 'bout, Willis?" from Diff'rent Strokes). This isn't just "What are you talking about?" It connotes total, comical confusion and disbelief at what someone just said.
Ain't that a... (as in "Ain't that a kick in the head?" or "Ain't that a shame?"). This structure connotes wry, resigned acceptance of a unfortunate or ironic situation. It's world-weary.
Don't even... (as a full sentence: "Don't. Even."). This connotes extreme warning and frustration. It means "Don't even think about saying or doing that thing you're considering."
If I were you...: This rarely connotes simple advice. It more often carries a connotation of a veiled threat, a strong warning, or condescension. ("If I were you, I'd start talking.")
Been there, done that: Connotes jaded experience, boredom, and a lack of interest in something because it's no longer new or exciting to the speaker.
Go ahead, make my day: (A famous movie line). This connotation is one of defiant challenge and anticipated pleasure in defeating an opponent. It's a power move.
These phrases are powerful because they pack a whole sentence's worth of attitude into a few slurred-together words. Using them instantly sets an informal, specific, and emotionally charged tone.